[www-scripts] Clang Attribute Doc Update: ERROR

[root via www-scripts]

UPDATING LLVM SOURCES
HEAD is now at 0de60b5 [mlir] Fix mlir build break due to warning when NDEBUG is not set
>From https://github.com/llvm/llvm-project
 * branch            master     -> FETCH_HEAD
   0de60b5..fb04d7b  master     -> origin/master
First, rewinding head to replay your work on top of it...
Fast-forwarded master to fb04d7b4a69831f6b999b1776da738557b108e0d.
CMake Error at CMakeLists.txt:3 (cmake_minimum_required):
  CMake 3.13.4 or higher is required.  You are running version 3.7.1


-- Configuring incomplete, errors occurred!